The move to usb-c for power has been awesome. I was able to maintain the battery's charge during light to medium load. 2015 MacBook Pro 13 Inch 500 (dal > Dallas north DFW ).
2015 Macbook Pro-15 in 200 (chi > Chicago city of chicago ) pic hide this posting restore restore this posting. In a pinch, I've worked 8 hours with my 15"mbp plugged into my 18w usb-c phone charger. Macbook Pro Charger 25 (Delafield, WI ) hide this posting restore restore this posting. This assumes that the laptop is off or is sleeping. Charging a 15"mpb from 0% to 100% battery takes about 8 hours at 15w. I don't have one available currently to verify exact charging watts. But if you have a 15"mbp and a 13"mbp, it seems like the larger device always supplies power to the smaller device. So even the OEM power supply will occasionally supply only 12.48w to the mpb.Īfter playing around with this more, the above method will work if you want to charge 2 identical devices. The OEM power supply for the 2016 15" mbp has 3 output modes: (And then you could upload that video on YouTube, claiming to discover infinite energy, and profit on the ad revenue) Using this method, you can even trick your laptop into thinking that it is charging itself. An app like coconut battery can help you see how quickly your laptop is charging. The second mpb will only receive 15w from the first.
Here are discharge rates I've observed on my laptop: In my experience, 15w is enough to power and charge the 15" mbp. I've tested it with the UpTab displayport with power delivery adapter and with the Apple multiport adapter (A1621). Use a dongle and hook them up like this: power supply > usb-c cable > mbp > usb-c cable > usb-c multi-port dongle > mbp2 ScunnerDarkly, Assuming the power supply is functioning properly then there are only 2 printed circuit boards in play in the Late 2013 MacBook Pro Retina 15' in this scenario, the MagSafe PCB and the Main PCB (or logic board).
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